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In Spanish, the abbreviations a.m. (from the Latin ante merídiem "antes del mediodía") and p.m. (from the Latin post merídiem "después del mediodía") are used. These abbreviations are written in lower case and using the indicated punctuation. For noon it is custumary to use m. (from the Latin meridies "mediodía"). For example:

In English pronouncing the abbreviations is just as common in speech as in writing but I'm sure I never heard anyone pronounce them in spoken Spanish though it's clear from the other answers here that they are normal in written Spanish.

In Spanish we have three major designations and one general designation in regards to expressing time. Gonzalo, A.M. is NOT Spanish, it is Latin for Ante. Sometimes it is easier to ask for gimeridio and post meridio, those two are more explicit and NOT abbreviated in becomes conversational Spanish. In the case of which a time may be 10 AM or 10 PM corresponding and . The general usage is when is and is usually for a situation where it is too late in the day for the activity though not particularity all that late in regards to your plans and so you would say meaning in the day. This instance is reserved for when you cannot or do not want to commit to a particular time frame and at the same time shifts the responsibility to your respondent to determine an appropriate time frame as well. Some would have to ask forgiveness; where is the Chrarisma when demanding?